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CVE-2021-26344· NVD / CVE Program· CNA AMD

An out of bounds memory write when processing the AMD PSP1 Configuration Block (APCB) could allow an attacker with access the ability to mod

Noroxi assessment

Priority: Monitor (action score 32/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

An out of bounds memory write when processing the AMD PSP1 Configuration Block (APCB) could allow an attacker with access the ability to modify the BIOS image, and the ability to sign the resulting image, to potentially modify the APCB block resulting in arbitrary code execution.

HighCVSS 8.2 · v3.1—No exploit No fix recorded
Published
Aug 13, 2024
Updated
Jun 16, 2026
EPSS
0.1% · 4th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
8.2
CNA · AMD
7.2
1.0 point gap

CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-26344

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
amdepyc 7203 firmware
amdepyc 7203
amdepyc 7203p firmware
amdepyc 7203p
amdepyc 72f3 firmware
amdepyc 72f3
amdepyc 7303 firmware
amdepyc 7303
amdepyc 7303p firmware
amdepyc 7303p
amdepyc 7313 firmware
amdepyc 7313

and 126 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • amd epyc 7001 firmwareall versions
  • amd epyc 7203 firmwarebefore milanpi_1.0.0.5
  • amd epyc 7203p firmwarebefore milanpi_1.0.0.5
  • amd epyc 7232p firmwarebefore romepi_1.0.0.c
  • amd epyc 7251 firmwareall versions
  • amd epyc 7252 firmwarebefore romepi_1.0.0.c
  • amd epyc 7261 firmwareall versions
  • amd epyc 7262 firmwarebefore romepi_1.0.0.c
  • amd epyc 7272 firmwarebefore romepi_1.0.0.c
  • amd epyc 7281 firmwareall versions
  • amd epyc 7282 firmwarebefore romepi_1.0.0.c
  • amd epyc 72f3 firmwarebefore milanpi_1.0.0.5
  • amd epyc 7301 firmwareall versions
  • amd epyc 7302 firmwarebefore romepi_1.0.0.c
  • amd epyc 7302p firmwarebefore romepi_1.0.0.c
  • amd epyc 7303 firmwarebefore milanpi_1.0.0.5
  • amd epyc 7303p firmwarebefore milanpi_1.0.0.5
  • amd epyc 7313 firmwarebefore milanpi_1.0.0.5
  • amd epyc 7313p firmwarebefore milanpi_1.0.0.5
  • amd epyc 7343 firmwarebefore milanpi_1.0.0.5

Versions reported by the vendor

Affected version ranges reported by the assigning authority (AMD). Independent of NVD's CPE analysis and usually ahead of it.

  • AMD AMD Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics

    • variousaffected

  • AMD AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics

    • various, variousaffected

  • AMD AMD EPYC™ 7001 Series Processors

    • variousaffected

  • AMD AMD EPYC™ 7002 Series Processors

    • RomePI 1.0.0.Cnot affected

  • AMD AMD EPYC™ 7003 Series Processors

    • MilanPI 1.0.0.5not affected

  • AMD AMD EPYC™ Embedded 3000 Series Processors

    • Variousaffected

  • AMD AMD EPYC™ Embedded 7002 Series Processors

    • EmbRomePI-SP3 1.0.0.6not affected

  • AMD AMD EPYC™ Embedded 7003 Series Processors

    • EmbMilanPI-SP3 1.0.0.2not affected

  • AMD AMD Ryzen™ 3000 Series Desktop Processors

    • variousaffected

  • AMD AMD Ryzen™ 3000 Series Mobile Processors with Radeon™ Graphics

    • variousaffected

  • AMD AMD Ryzen™ 3000 Series Processors with Radeon™ Graphics

    • CezannePI-FP6 1.0.0.Enot affected

  • AMD AMD Ryzen™ 4000 Series Desktop Processors with Radeon™ Graphics

    • variousaffected

Same product

amd: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-21980Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to potentially overwrite a guest's memory or UMC
    31Monitor
  • CVE-2024-21978Improper input validation in SEV-SNP could allow a malicious hypervisor to read or overwrite guest memory potentially leading to data leakag
    31Monitor
  • CVE-2023-31355Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to overwrite a guest's UMC seed potentially allo
    24Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records